Hi all.I have a wordpress blog which is hosted on there servers.Like xxx.wordpress.com.And I want to show my old as well as new posts to this blog.Due to i am not hosting the blog,I cant use plugins.So when I came to know about rss graffity app,I added it to my page and nothing happened.Means there are no posts on my timeline.Can anyone tell where I am going wrong?Or what is the procedure of adding this app?Please help me.

P.S:I opened the link xxx.wordpress.com/rss.xml and it shows all the data.And it shows 0 errors in apps interface